Relief-valve.



T. D. VHLLEA.

REUEF VALVE.

APPLICATION HLE DEC. 5.1917. Lglg Patented ct. 22, 12H8E o2\5 3,5 5 lg7/5 INVENTOR 7? MKW, BY

ATTORNEY,

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application led December 5,

be forced `into the tire by the pump.

further object of the invention is to permit anyfexcess pressure to `beautomatically relieved during the operation of pumping' up the tire. Afurther object is to provide means for relieving or allowing the escapeoit-air should the pressure be greater than that required, and toautomatically have the valve close at a predetermined pressure. lt y isa well known fact, that in pumping up tires by means of a pump that isattached to the motor of the machine, or to a supply tank oi' air. thatthere is danger of the tire being inflated to too high a pressure. ihepresent invention is, therefore, designed to avoid the possibility ofexcessive pressure. A further object is to provide means for setting thevalve at a predetermined pressure so that. when this pressure isreached, it will automatically open and allow the air to escape to theatmosphere, thus preventing the tire from beingover inflated. l

Referring to the drawings: l

Figure 1 is a vertical sectional view through the axis of the valve',showing the interior construction thereof.. which comprises, in general,an outer casing having an interior thread, an inner cylindrical casinghaving a connection with this thread and designed to be rotated in theouter cylinder, and the valve device It'or automatically relieving thepressure.

`Fig. 2 shows the position of the parts at the time the valve isautomatically opened to relieve the excess pressure.

Fig. 3 is a horizontal sectional view on the line 3-3 of Fig. 1 takenthrough the valve stem and spring which normally holds the valve closed.y l

Fig. i is a horizontal sectional view on' the line ot i showing' therelation of the outer cli/'vlinder and the inner cvliir der. thetension'spring and the inner rubber tubing'.

Fig. 5 is a detail viewv of the outer ovinider, a portion of the sainebeing 11roken away to illustrate the interior threaded construction.

Gis an elevational view of the inner cylinder showing the air pressurefigures marked thereon and the struck up tins which form teeth forengaging threads of the outer cylinder.

F 1g. 7 1s a modIiication.` Referring to the drawings in detail:

. 1 indicates the stem to which the hose of thef air pump is connected.rlhis stemis secured to the base piece 2 by means of the head-ed orriveted connection 3. and is formed with an opening 4 to permit the airunder .pressure to pass downward through the passageway 5 into the tire.The upper end of the base piece 2 is threaded as indicated at 6 toreceive 'the threads 7 at the lower end of the outer casing 8. rlhiscasing is formed with the internal threads 9. rlfhe upper end of theouter casing S is formed with a contracted portion 10. Located withinthe casing 8 is the cylindrical member 11, a detail in elevation beingshown in llig. G. This member is formed with outwardly projecting ribs12 which serve as teeth for engaging the threads 9 of the member 8. Thesectional view in `Fig. 1 clearly shows the assembled construction. `ltis clear that by rotating the member 11 in the outer casing S that thecylindrical member 11 can be raised and lowered relative to the upperend or edge 13 ot' the outer casing. 14 designates a threaded block:which is screwed into the threaded part'7 of the .outer casing 8. Thisblock is formed `with a seat 1'5 on which rests the lower end of thecoiled spring 16. 17 is a tube composed of rubber that is located withinthe spring 16 and extends upward to nearly the upper end or" the spring.Thelower end of the rubber tubeis formed .with a thickened portion 18,which is located below the block 1li. rlhe thickened portion 18 isclamped between the threaded block 14 and the base piece 6 below whichis located the perforateddisk 19. inserted .in the rend of the spring 16is a `thirnble shaped member 20, which is formed withthreadstoreceivethe upper end of the sprmg, a ndf,lncated m the upperenti ot the membe1m20- is cup shaped member llt) 21 formed with anopening 22 to allow for the escape of the air from the interior of thetire, as will be fully described later.

designates a valve of any suitable material the lower end of which ismade conical in shape or pointed. The valve 23 is inserted in the rubbertube 17 before the parts are assembled, by inserting the valve stem 25through the opening 2-1 in the base portion of the rubber tube. Attachedto the valve. 23 is a stem 25, which passes through the opening 2-1. in'the lower side of the thiinble shaped melnber 20, and also through theopening 21 in the upper end of the rubber tube 17. It also passes'through an opening in the upper end of the cup-shaped member 21.Located within the member 2() is a coiled spring 26, the upper end ofwhich is attached to the stem 25 as indicated at 27. This spring restson the lower end of the thimble shaped member 2() and normally acts tore tain the valve 23 is a closed position. It will be noticed that thestem 25 normally projects upward above the upper surface of the cupshaped member 21. Secured in the upper end of the cylindrical shapedmember 11 is a knob or handle piece 28 and located in this iece is ascrew 29 which extends downwarc with its lower end 30 within thecylindrical member 11. The upper end of the Cylindrical member 11 isformed with an opening 31 to permit the compressed air to escape fromthe interior of the rubber cylinder 17 when the valve 23 is open to theatmosphere. (See Fig. 2.) The opening 24, it should be observed, isformed with three radially extendin branches clearly shown in the planview 1n Fig. 3. The outer surface of the cylinder 11 is provided withnumerals 32, which indicate the pressure of the compressed air withinthe rubber tube 17 and consequently the same pressure within the tirewhen the valve opens during the operation of inflation.

Referring now to the operation of my invention, it is to be understoodthat air under pressure is forced into the tire through the tubularconnection 1, to which a suitable line of hose is attached. The valve23,as stated,

`is in a closed position.- The cylinder 11 is first rotated within theouter casing 8 in order to bring any one of the numbers 32 whichindicatesthe pressure required, so as to register with the upper edge 13of the outer casing. This )art of my valve is known as the Schradergage. As the air is 'being pumped into the tire it will at `the sametime )ass upward into the rubber tube 17 through the opening 33 in thedisk 19. The purpose of the disk 19 is to prevent the portion 18 of therubber tube 17 from being distorted or forced out of place ,when the nut14 is turned down, as there is a possibility of the rubber buckling upor becoming'uneven which would produce a joint that is no tl air-tight.The disk 19 would prevent this as 'it would slip on the upper edge ofthe basespiece. rl`he purpose of the tubular` member 33 is to maintainthe lower end of the rubber tube 1 7 open at all times as there is apossibility of the tube collapsinfr at this point when the air pressureis withdrawn. The air within this rubber tube causes the spring 1G tostretch carrying with it the rubber tube 17. lVhen the pressure withinthe tire reaches the predetermined pressure, say for example pounds` thelower end 3()l of the. threaded screw 29 in the knob 28 engages theupper end of the stem causing the valve 23 to move downward to an openposition. It

should be stated that the ligures 32 on the barrel 11 have beenpreviously placed thereon and which accurately indicate the pres surewithin the tire when the valve opens,

these figures having been verified by means but will readily escape tothe atmosphere when the parts are in the position shown in Fig. 2. Uponthe stopping of the air pump, the valve immediately closes at thepredetermined pressure indicated on the cylinder 11 by any one of thenumerals 32.

From this construction it will be seen that an accurate means isprovided for quickly setting and automatically determining the pressureof the air in the. tire at the end of the operation of inflation withoutthe necessity of detaching the hose and applying a gage to the valvestem. It will also be seen that an accurate means is provided forquickly setting the relief valve to the pressure desired in the tirewithout the necessity of detaching the hose when the tireis-beinginflated. It is also clear that this device will automaticallyallow for the escape of air from the tire, should the pressure, for anyreason, increase during the operation of the machine. The device isattached to the sual valve stem by means of the usual rotatable collar3l, |which turns on the connecting piece 35.

It is to be understood that I do not limit myself to the specific use oftins. indicated at 12. on the inner cylinder 11, as I may, if desired.use a full thread, or threads. or any equivalent device for connectingthe two cylinders together.

Referring to the modilication shown in Fig. 7, the rubber tube 17instead of being formed with a closed upper end is made open as shown at17. Secured into the upper end of the spring 16 is a coupling or tubularmember 20. 21 designates acap that is threaded into the member 20'.' 23designates a valve for closing the opening 24 in the cap 21'.. Thevalve'stem 25 passes through the opening 24 to the upper end of whichthe spring 26 is attached, as shown at 27, for normally holding thevalve closed. 36 is a metallic Washer for clamping the flange 172 to thecoupling 20. The pin 30, as above described, engages the upper end ofthe valve stem to move the valve .23 open when the rubber tubing17iseXtended by the compressed air therein.

`What I claim is: 1. In a relief valve for pneumatic tires, thecombination, with an outer cylindrical member, an inner cylindricalmember adjustably attached thereto, and having means to provide relativemovement between said members, but retaining said inner member 25 rin'its adjusted positiona coiled spring vvithin the inner member and arubber tube Within the coiled spring andhaving -an opening therethrough,a thimble shaped device secured to the upper end of the coiled springfor closing the same, a valve located below the opening, a spring fornormally operating the valve for closing the opening in the rubber tube,a stem connected to said valve and extending through the opening in therubber tube and u Wardly to and Within the thimble device o the innercylinder member, an adjustable device carried by the inner cylindricalmember for engaging the valve stemfor opening the valve when 40 thepressure within the rubber tube reaches a predetermined amount, asindicated on the inner cylinder, whereby further inflation of the tireor other body is prevented.

Y 2. In a tire iniiation relief valve, the combination, with an outermember, an inner member having a threaded connection there with and forrelative movement Within the outer member, the upper end of the innermember having numerals thereon to indicate the air pressure, meansarranged within the inner member for communication with the air Withinthe tire to be inflated and comprisin a rubber tube having an openingtheret rough, said.tube being located within an extensible spring, athimble shaped member located within the upper end ofthe spring andengagin the upper end of the rubber tube, a cup s aped member forclosing the open end of the thimble shaped member,'an expansible springlocated Within the thimble shapedpmember, a valve stem passing throughthe cup shaped mem- `ber and the end of the thimble shaped member, avalve secured to the valve stem and 65 Within. the rubber tube for`normally closing the opening in the rubber tube, a projection securedto the inner cylinder for engaging the valve stem as the spring isextended a definite distance corresponding with the pressure Within thetube, means to permit the air to escape to the atmosphere as the valveis opened.

3. In a pressure regulating valve for pneumatic automobile tires, thecombination, of an outer casing, an adjustable tubular member locatedtherein and attached to the outer casing for designating a predeterminedpressure, extensible means within the tubular member for confining theair in said tubular member, a valve located Within the eXtensiblemember, means for opening the valve when the predetermined pressure isreached and additional means for autonntically closing the valve whenthe excess pressure above the predetermined pressure is reduced to thepredetermined pressure.

4. In a de vice of the class described, in combination, with outer andinner cylindrical members having inter-engaging and adjusting'devices,the inner cylinder having numerals to indicate a predetermined pressure,an adjustable stem at the upper end of the inner cylindrical member, avalve Within saidinner member, a stelnsecured thereto for engaging thestem of the inner` cylindrical member for opening the valve when aVpredetermined pressure shown on the inner cylindrical member is reached.

In a pressure regulating device, the combination, With outer and innercylinders, a threaded connection therebetween to permit of adjustment ofone cylinder relative to the other for the purpose of adjusting thedevice to a predetermined pressure, an extensible coiled spring and anelastic member located Within the coiled spring, the elastic memberhaving its lower end secured to the outer casing, its upper end beingformed with an opening, a valve for closing the opening, a stem on thevalve projecting u Ward through the opening in the elastic member, butof less diameter than the opening, a chambered casing secured to the eX-tensible coiled spring for providing a bearing for the valve stem, aspring located Within the chamber of the casing and secured to the valvestem for normally holding the valve in a closed position, the inner`cylinder having an adjustable device for engaging the valve stem forcausing the valve to open when the predetermined pressure of air isintroduced into the elastic chamber, said spring within the casingserving to close the valve when the air pressure is shut 6. In apressure regulating device, comprising in'combination, an outer casing,an inner casing connected to the outer casing and having relativemovement with the outer casing, its upperend having figures on itscircumference to register with the upper edge of the outer easing, meanslocated Within-t-he inner casing for receiving air under pressure andcomprising an elastic member .located Within an extensible spring, acasing secured to the upper end of thespring and formed With an'openingin itsupper and lower ends, avalve located within the elastic casing,means carried by the inner casing for engaging the stem of the valve foropening the vsame at a predetermined pressure, and means in the casingat the end of the spring fpr closing or returningr the valve when thesupply of air is shut oi, as described. 4 x I 7. An air pressure reliefvalve for pneumatic tires and the like comprising, in combination,outeand inner casings having a threaded connection with each other fordetermining the pressure at which said valve Will op'en,`ineans forconnecting the saine to tlie Valve stem of a tire, an extensible memberin lcommunication with the interior ofl the tire being inflated andhaving an opening therethrough, a valve for closing the opening, meansfor unseating'the valve when the pressure in the extensible memberassumes a deiinite predetermined pressure and means for retaining thevalve normally closed, said inner casing having markings vthereon toindicate the predeterminedpres- 8. An air pressure relief valveconstrueA tion. comprising, in combination, outer and Laaaeia Ivalvestem for returning the valve to its closed position when the extensiblemember returns to the normal position. v

9. A pressure relief 'valve constructie means for adjusting one memberrelative to the other and for retalning the same in such adjustment, theadjustable member having' numerals thereon to indicate desired pressuresat which the relief valve will operate, an extensible member within theadjustable member, and having its endsopen, a liollow casing secured tothe extensible member and serving to close one of its ends, a fixed stopon the adjustable member, a valve carl ried by the casing on theextensible member and operated by the stop on one of the adjustablemembers when the pressure in the extensible member corresponds to thepressure indicated by a numeral on. the adjustable member, as described.

THOMAS D. MILLEA.

' 50 comprising, in combination, two members,

